-The most straightforward description of this system includes three species: two gene states, `G_on` and `G_off`, and mRNA `M`. The state space for this system is 3-dimensional. We know, however, that `G_on` and `G_off` never occur at the same time, indeed the conservation law `[G_on] + [G_off] = 1` allows us to express the state of the system in terms of `G_on` and `M` only. The state space of this reduced system is 2-dimensional.If we use an mRNA cutoff of 100, the state space for the original model has size ``2 \times 2 \times 100 = 400``, while the reduced state space has size ``2 \times 100 = 200``, a two-fold saving. Since the FSP get computationally more expensive for each species in a system, eliminating redundant species as above is recommended for improved performance.
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